Nature: Why We Love Cats and Dogs? 7 pm
Ask anyone and they immediately know — they’re either a dog person or a cat person. What is this all about? Follow an in-depth investigation into the great divide between dogs and cats and just what draws us to these two polarizing pets. Animal behaviorists, psychologists, trainers and devoted owners all weigh in. Dogs, we discover, are geniuses at reading what we want and the complex cat-human bond can be as fickle or as deep as a marriage. Funny, touching and provocative, we ask how well we really know our best friends and why we love them so much.

NOVA: The Incredible Journey of the Butterflies 8 pm
Every year, 100 million monarch butterflies set off on an incredible journey across North America. These beautiful creatures fly 2,000 miles to reach their remote destination: a tiny area high in the mountains of Mexico. Yet scientists are still puzzling over how the butterflies achieve this tremendous feat of endurance – and how, year after year, the monarchs navigate with such hair’s-breadth precision. NOVA flies along with the monarchs, visiting the spectacular locations they call home and meeting the dangers they encounter along the way. As this program reveals, the monarch is a scientific marvel locked in an inspiring struggle for survival.

Through A Dog’s Eyes 9 pm
This program is about dog trainer Jennifer Arnold, the service dogs she trains and the families whose lives they have changed. Arnold’s non-profit organization, Canine Assistants, trains dogs to assist people with a variety of disabilities. Based in part on Arnold’s forthcoming book of the same name, the film also presents the science that explains the amazing dog/human bond and what makes Arnold’s training techniques so effective for anyone with a canine in the family.